I think someone is trying to convince his wife he needs 2 new 80ch UHFCB's
How they added the extra channels was to put new channel (frequency allocation) in between the existing channels.......so the new Channel 41 on the frequency spectrum sits in between the current channel 1 & Ch 2 that are spaced 25Khz apart.....this spacing is known as wide band.....the new spacing that has been around for some time now is Narrow Band at 12.5khz spacing.
This is designed to give more options for use in the existing frequency spectrum.
To give an analogy.....you have a 3 bedroom house with a single bed in each bedroom but need to accommodate more people in the home so you move the existing single bed aside and add another to the room under the same roof........house is still the same size but accommodates double the people, catch is the over worked sewerage system of the house suffers some what, new band plan suffers from splatter with other near by frequencies in the same manner at time.
You may notice when conversing with a person using your old 40Ch radio (wide band) and the new 80ch (Narrow band) on the same channel of Ch.20 that the volume of the old set will need be substantially higher than normal to here the new radio........becomes a little of an nuisance issue if operating in a convoy with a mix of old and new UHF CB radios.